A supramolecular polymeric chain in the cobalt(II) complex with diclofenac: synthesis, crystal structure, spectroscopic, thermal and antioxidant activity

Abstract

A cobalt(II) complex with empirical formula [Co(dicl)₂·(H₂O)₃]·MeOH (where dicl = diclofenac) was synthesized and characterized by elemental analysis, flame atomic absorption spectroscopy (FAAS), infrared spectroscopy (FTIR) and thermal decomposition techniques (TGA). The crystal structure of the complex was determined by single crystal X-ray diffraction technique. The compound crystallizes in the monoclinic space group I2/a. Apical water molecules link adjacent cobalt(II) ions forming polymeric chains along the crystal a axis. The thermal behavior of the complex was studied by TG/DTG/DTA, TG/MS and TG/FTIR methods under non-isothermal conditions in air. Upon heating [Co(dicl)₂·(H₂O)₃]·MeOH decomposes progressively to metal oxides, which are the final products of pyrolysis. Furthermore, antioxidant activity of the complex was examined.

Graphical Abstract

Keywords:

• Co-complex
• diclofenac complex
• thermal analysis
• FTIR spectroscopy
• nonsteroidal anti-inflammatory drugs

Acknowledgements

The authors wish to thank Dr Anna Pietrzak for helpful advice on the quality of the structure analysis.

Disclosure statement

No potential conflict of interest was reported by the authors.